Least detrimental gear for WOT

[RVTRKN]

I'm in the category of weekend driving. I always warm it up first, then drive in T/H without the EB on, and drive it like my normal. To each is own, trashing it is another story. WOT won't hurt it, with a few exceptions that have been noted already. The big no no for me is getting on it heavy, then letting off quickly.

 

[Ozymandias]

The 68 controls its slippage in each gear and for every shift, it has sensors in it for that. It will go in limp mode if it detects anything going out of spec.
It won't let you go into throttle if the gear isn't "locked" properly.

So, no you don't need to be afraid to get stranded.

That's my opinion on this.

For peace of mind, these trucks and trannys ar also used as company cars with company drivers, people that don't care the slightest about it.
And the trucks last anyways.

 

[Wiredawg]

Thank you very much for the response. You take a stance and back it up with a detailed explanation. The forum nazis must be losing their mind.

Being a MT guy mostly, I didn’t know these details on the auto. What you say makes sense, I will try to do that going forward.

I did feel like something wasn’t right when I abruptly let off, transmission seemed confused/lost and then a gear would lock in not with a bang, but noticeably more harsh than a standard upshift.

As another guy mentioned, living in socialist Long Island NY, our highways get packed. Even in rush hour before traffic actually slow, the step before that is traffic still moving at 65-75 in a 55, but all vehicles including trucks are up each other’s asses... one or two car lengths apart. On top of that, on ramps can be very short. Do you have to build up speed very quickly and time your “slot” perfectly. This usually requires you go accelerate hard 75% throttle, and then instantly go from accelerating to a speed, to maintaining that speed, and sometimes even slowing down from that speed, which often ends in an abrupt dethrottle. I figured this has to be a common occurrence and part of rams R and D, so I didn’t think that doing that same thing for recreation would be that bad...

It’s good to know that I should try, within reason, to avoid going from large load to no load scenarios.

Sorry I fell short of explaining what torque management is. It often hard to tell how much or little folks know.

Have fun, Ron

 

[Aftershock00]

Hey guys, just wanna say thanks. I’m following what you’re saying that letting off throttle being a no no, and obviously, I will follow your advice.

When I drive a manual, I’m used to light switch dethrottling. When I drive an auto under normal conditions, I of course don’t dethrottle and I use the dimmer switch style. Under WOT though, when I’m driving just for a few “fun” seconds, I thought this was the gentler way.

Obviously the consensus is that I’m not doing it any favors by doing this, and likely making matters worse. I’m not questioning that this is the case, but being a mechanically minding guy with a thirst for understanding things, can anyone explain why this is bad, as in, what is happening to/in the transmission that I don’t want to happen, compared to staying on the throttle for the shift.

People are saying matter of factly that this is a no no, but thank god for this thread cause this is the first I’m hearing of it. Admittedly, it didn’t feel right in a literal sense, but didn’t realize it was actually detrimental.

This has been a very educational thread for me so far, so thanks to all who contributed.

 

[cerberusiam]

Ummm, the "dumping" of the throttle is not god for manual trucks either. That unloads the driveline suddenly, the G-56 does not like that anymore than it likes a sharp TQ rise. In addition that is really hard on turbo's to suddenly pull all the fuel out when they are spinning that fast. Granted, these CR engines do not just defuel suddenly so it mitigates to a point but still not a good idea, again the best way is roll into and roll out of the throttle. Many a turbo has been blown up by dumping the throttle at high rpm's and boost.

There is only so much the programming can do to mitigate damage and the right foot can over ride most of it. As for the the engine OR trans not able to hurt itself, that is a fairy tale. Just ask the guy that went thru 5 stockish rebuilds before dropping the coin on a Revmax to handle the rated GCVW of his truck. Pick any forum, look at issues with HG's, stock or tuned.

Like I said the BEST thing you can do for longevity is an updated VB with some solid tuning. Want to play, you will have to pay at some point.

 

[Ozymandias]

Cerb you are talking to a newbie, don't make him think that these Trannys grenade any minute.
It needs a little more of abuse to really harm them then just let flip the throttle a couple times.

 

[AH64ID]

Manuals like shock loading even less.

It not rapid lifting that is a huge issue, it’s a rapid lift with an immediate rapid WOT that’s the hardest, IMO.

Don’t drive like a idiot and it’s going to be fine. Pretend there is an egg under your foot. Use WOT all you want. They can survive WOT with an immense amount of resistance, thru all the gears.

 

[Cummins12V98]

I am wondering if the OP is Stuart with a new user name???

 

[Aftershock00]

Manual transmission.... if at WOT... depress pedal fully, wind out gear, simultaneously release gas pedal fully and depress clutch, relatively simultaneously release clutch while getting on gas pedal? What am I missing? Been driving mt cars, MT motorcycles, and class B trucks for over a decade....granted the real trucks don’t even need clutch....had over 150k on my daily driver clutch...never had a transmission issue.

And as far as a newb, yes when it comes to light duty auto turbo diesels, I’ll wear that badge, that why I’m actually asking questions despite some people that just want me to take their word and close the thread immediately “our leader has spoken”.

As far as don’t abuse it, sad but true, that is a broadly subjective term. I know people that start vehicles in sub freezing temps and Throw it in gear seconds later, only to go WOt. I know people that can care less about oil change schedules, or people that throw it in drive when they’re still flying in reverse. Most people’s driving habits make me cringe. So whether I’m doing wrong or not, I’m not debating, but I know there is a significant population of people who have vehicles that pray every day they were owned by me.

 

[Aftershock00]

Manuals like shock loading even less.

It not rapid lifting that is a huge issue, it’s a rapid lift with an immediate rapid WOT that’s the hardest, IMO.

Don’t drive like a idiot and it’s going to be fine. Pretend there is an egg under your foot. Use WOT all you want. They can survive WOT with an immense amount of resistance, thru all the gears.

I hope I didn't misrepresent what I WAS doing. I was not accelerating, quickly letting off, and then quickly slamming the gas pedal for WOT. I was starting from a stop, accelerating relatively normal in first gear, transmission hits 2nd gear, I accelerate normal for a second or two in 2nd, then I punch the throttle, let it wind up for a few seconds, then when its getting to where it would shift/redline, I typically let off and let EB slow me down. There is no repunching of the throttle.

Not sure if this makes it any better or worse, but just figured I'd clarify. Seems like instead of letting off at the top end of 2nd, I should let transmission move to 3rd, and then ease off the gas pedal, no?

 

[R.Taylor]

By the time I get on my on-ramp I'm at 160 degrees... And then..... WOT with my eyes in the side mirror as I merge over with authority.... Amazing how quick I find myself 4 lanes over in the far left. I feel each gear shift.... Feels fine to me. Turning 2100rpm at about 87mph in the end with a constant 2 to 4 psi of boost pressure. After I hit 500 miles on my 2019... I gently hammer it every time I drive it. If your not towing often, Hammer it (grown-up like).